127,715 research outputs found
Cardiopatia ischemica ed invalidità pensionabile: indagini funzionali e valutazione medico-legale
No full textIl lavoro si occupa della valutazione di pazienti cardiopatici ai fini della definizione del loro stato di invalidità (invalidità pensionabile
Detection of damage in beams subjected to diffused cracking
No full textThis paper addresses the problem of identifying structural damage affecting one zone of a beam using measured frequencies. The beam model has a zone in which the stiffness is lower than the undamaged value. Damage is defined by three parameters: position, extension and degree, which need to be identified in the inverse problem. The solution of the direct problem is first obtained and the peculiarities of damage detection are examined. Two different procedures for damage identification are proposed, which use frequency measurements and take advantage of the peculiarities of the problem: the first procedure is based on the characteristic equation error and the second on the comparison between analytical and experimental frequency values. The identifiability and ill-conditioning properties are discussed by referring to cases with pseudo-experimental data. (C) 2000 Academic Press
Alcune considerazioni sulla stabilità di barre di armatura in elementi in c.a. sottoposti a processi di corrosione
No full textAssessment of corrosion damage in prestressed rc beams by static and dynamic experimental tests
No full textCD-RO
Detection of localised damage in plane circular arches by frequency data
No full textThe possibility to detect the structural damage affecting a narrow zone of a doubly hinged plane circular arch by means of a few measured natural frequencies is considered. Such localised damage induces a discontinuity in the bending stiffness of the arch, modelled as a torsion spring joining two adjacent sections and characterised by the location and the stiffness of the spring. The direct problem in the damaged and undamaged case is examined; the inverse problem is then considered. Two different procedures to identify the damage parameters are introduced: the ?rst is based on the search of an intersection point of curves obtained by the modal equation; the second is based on the comparison between the analytical and experimental values of the variation of frequencies passing from the undamaged to the damaged state. In conclusion, the possibility of identifying the damage parameters by means of pseudo-experimental data is examined
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